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mRNA is one of the 3 types of RNA: the others being tRNA and rRNA. They all play a role in protein synthesis. mRNA stands for messenger ribonucleic acid. It is made by copying a strand of DNA called the t...

The different types of transport across a membrane can be divided into two main categories: active and passive transport. Active transport requires metabolic energy in the form of ATP and molecules are mo...

With this question you really have to take into account how many marks you are given (in fact I'd say this is the case in most biology questions) as you want to make sure you have made one point per mark ...

the sodium-potassium pump enables the passage of sodium and potassium ions. Both of which must be present. This uses energy as it is done via active transport. They move across their concentration gradien...

Pyruvate converts to Acetylcoenzyme A in an oxidation reaction. Pyruvate and coenzyme A combine to form acetylcoenzyme A. One of pyruvate's 3 carbon atoms goes to form a molecule of carbon dioxide, which ...